we need to protect their environment. we have a strict quarantine system to protect the integrity of the environment. forty years on, it's still a class-a nature reserve. it's our job to look after them. ...it's my job to look after it. ♪ >>> a burned out house in richmond that was abandoned at the start of the housing crisis was torn down today. city officials say the home on chancellor avenue was a magnet for squatters, illegal dumping, and drug dealing. it caught fire three times, and they say the owner refuseesed to do anything about it. so city leaders got a court order to have it torn down. >> we had to track down the property owner. we had to determine who owned the property, the lien holder. then we have to go to court and try to get them to approve a warrant. >> wells-fargo, who was holding the lien agreed to pay for the demolition. neighbors say they're deleted to see it gone. the city is working on condemning, and demolishing four other abandoned homes. >>> it's a battle of preservation. proposed changes to y